CN108432129B - Power amplifier control method, device and system - Google Patents

Power amplifier control method, device and system Download PDF

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CN108432129B
CN108432129B CN201580085531.8A CN201580085531A CN108432129B CN 108432129 B CN108432129 B CN 108432129B CN 201580085531 A CN201580085531 A CN 201580085531A CN 108432129 B CN108432129 B CN 108432129B
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power amplifier
envelope
signal
phase
link
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CN108432129A (en
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张立鹏
蔡中华
王开展
焦伟
庞志远
朱胜
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0216—Continuous control
    • H03F1/0222—Continuous control by using a signal derived from the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3282—Acting on the phase and the amplitude of the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/56—Modifications of input or output impedances, not otherwise provided for
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
    • H03F3/602—Combinations of several amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/102—A non-specified detector of a signal envelope being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/336—A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/408—Indexing scheme relating to amplifiers the output amplifying stage of an amplifier comprising three power stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/423—Amplifier output adaptation especially for transmission line coupling purposes, e.g. impedance adaptation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)

Abstract

A power amplifier control method, device and power amplifier control system, suitable for the power amplifier system including envelope control circuit and Doherty power amplifier circuit, can according to the envelope signal that the baseband unit outputs, produce the phase modulation control signal (401), and according to the phase modulation control signal to the signal of main power amplifier link and/or auxiliary power amplifier link of the Doherty power amplifier circuit, make the phase difference between signal of main power amplifier link and signal of the auxiliary power amplifier link after the phase modulation be the setting value corresponding to present value of the envelope signal, the setting value is when the supply voltage of the power amplifier circuit of the Doherty is the envelope voltage corresponding to present value of the envelope signal, the best phase value (402) of the power amplifier circuit of the Doherty, thus has solved the problem of effects that the existing high-efficiency power amplifier technology exists are relatively poor, performance is not good, etc..

Description

Power amplifier control method, device and system
Technical Field
The invention relates to the field of wireless communication, in particular to a power amplifier control method, a power amplifier control device and a power amplifier control system.
Background
In order to improve the spectrum utilization efficiency, the wireless communication uses modulated signals of various systems, such as OFDM (Orthogonal Frequency Division Multiplexing), CDMA (Code Division Multiple Access), TDMA (Time Division Multiple Access), and so on. However, in OFDM, the signal has a high peak-to-average ratio, and thus, the requirement for a base station power amplifier is high. In order to amplify the signals with high peak-to-average power ratios without distortion, the power amplifier of the base station may adopt two modes, one mode is power backoff, that is, the operating state of the power amplifier is set to class a or class AB, but because the characteristics of the power amplifier tube are limited, the mode may cause a great reduction in the power amplifier efficiency, and under the condition of the same output power, the base station may consume more energy; the other is a high-efficiency power amplification technology, the method not only can obtain higher power amplification efficiency, but also the linearity of the power amplification can meet the requirements of related protocols.
Currently, the high-efficiency power amplification technologies commonly used in the industry may include a Doherty (Doherty) technology and an ET (Envelope Tracking) technology, and specifically, the technologies may be classified into the following three technologies:
first, a high-efficiency power amplification technology based on a traditional ET power amplifier. As shown in fig. 1, the ET power amplifier may generally include an envelope modulator and an AB class power amplifier, where the envelope modulator generates an envelope voltage to replace a fixed voltage to supply power to the power amplifier, so as to perform envelope tracking on the power amplifier, so that the power amplifier is always in a working state close to saturation, and the working efficiency of rollback is improved.
However, since the overall work efficiency of the ET power amplifier is equal to the product of the work efficiency of the envelope modulator and the work efficiency of the power amplifier, and the work efficiency of the envelope modulator cannot reach 100%, there is a certain efficiency loss, especially under the modulation signal with high peak-to-average ratio, the back-off efficiency is difficult to reach high due to the limitation of the power amplifier itself; in addition, once the envelope voltage is too low, the gain of the Power tube is greatly reduced, and the PAE (Power added Efficiency) is further deteriorated, so that the Power amplification effect or the Power amplification performance of the Power tube is not good.
Secondly, as shown in fig. 2, the Doherty ET power amplifier may include an envelope modulator, a Doherty main power amplifier, and a Doherty auxiliary power amplifier (i.e., a peak power amplifier), where the envelope modulator is connected to the main power amplifier to perform envelope tracking on the main power amplifier, and the auxiliary power amplifier is powered by a fixed voltage, so that efficiency of a peak-to-average ratio signal under backoff can be improved by using a backoff efficiency advantage of Doherty.
However, since the larger the voltage ratio between the main power amplifier and the auxiliary power amplifier of the Doherty is, the larger the asymmetry of the Doherty is, and the larger the pit of the power amplifier efficiency is, the improvement of the efficiency by this method is limited, and the auxiliary power amplifier of the Doherty cannot be configured with a very high voltage due to the influence of the breakdown voltage of the power tube, so that there is a problem that the saturation power of the power amplifier cannot be further improved, and thus the power amplifier effect or the power amplifier performance of this method is not good.
Thirdly, based on the high-efficiency power amplification technology of the separately fed Doherty ET power amplifier, as shown in fig. 3, at this time, the Doherty ET power amplifier may include an envelope modulator, a Doherty main power amplifier and a Doherty auxiliary power amplifier, and the envelope modulator is connected to both the main power amplifier and the auxiliary power amplifier to perform envelope tracking on the Doherty main power amplifier and the Doherty auxiliary power amplifier, so that the efficiency of the peak-to-average ratio signal under backoff can be improved by using the backoff efficiency advantage of Doherty.
However, because the signal of the Doherty main power amplifier link and the signal of the auxiliary power amplifier link have different phases under different voltages, the phase of the Doherty power amplifier cannot reach the optimum under different envelope voltages, and thus the power amplifier effect of the method is poor and the power amplifier performance is not good.
In summary, the conventional high-efficiency power amplifier technology has the problems of poor effect, poor performance, and the like, and therefore, a new power amplifier technology is needed to solve the above problems.
Disclosure of Invention
The embodiment of the invention provides a power amplifier control method, a power amplifier control device and a power amplifier control system, which aim to solve the problems of poor effect, poor performance and the like of the existing high-efficiency power amplifier technology.
In a first aspect, a power amplifier control method is provided, which is suitable for a power amplifier system including an envelope control circuit and a doherty power amplifier circuit, wherein the envelope control circuit includes an envelope modulator for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage as a supply voltage to the doherty power amplifier circuit; the Doherty power amplifier circuit comprises a main power amplifier and an auxiliary power amplifier, wherein the main power amplifier and the auxiliary power amplifier are respectively used for amplifying baseband signals output by a baseband unit according to envelope voltage output by an envelope modulator, and the method comprises the following steps:
generating a phase modulation control signal according to the envelope signal output by the baseband unit;
and performing phase modulation on signals of a main power amplifier link and/or an auxiliary power amplifier link of the Doherty power amplifier circuit according to the generated phase modulation control signal, so that the phase difference between the signals of the main power amplifier link and the auxiliary power amplifier link after phase modulation is a set value corresponding to the current value of the envelope signal, and the set value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the envelope voltage corresponding to the current value of the envelope signal.
With reference to the first aspect, in a first possible implementation manner of the first aspect, generating a phase modulation control signal according to an envelope signal output by a baseband unit includes:
if the current value of the envelope signal is not larger than the set envelope starting threshold value, generating a first phase modulation control signal according to the envelope signal; the first phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a first phase value, and the first phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the minimum envelope voltage; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be the set maximum value of the envelope signal, generating a second phase modulation control signal according to the envelope signal; the second phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link to be a second phase value, and the second phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the maximum envelope voltage; wherein the set envelope signal maximum is greater than the set envelope turn-on threshold; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be larger than the set envelope starting threshold value and smaller than the set maximum value of the envelope signal, generating a third phase modulation control signal according to the envelope signal; the third phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplification link and the phase-modulated signal of the auxiliary power amplification link to be a third phase value; and the third phase value is obtained by performing linear interpolation operation according to the current value of the envelope signal, the first phase value, the second phase value, the envelope opening threshold value corresponding to the first phase value and the envelope signal maximum value corresponding to the second phase value.
With reference to the first aspect, in a second possible implementation manner of the first aspect, the phase modulating a signal of a main power amplifier link and/or an auxiliary power amplifier link of a doherty power amplifier circuit according to a generated phase modulation control signal includes:
after performing frequency conversion processing on baseband signals corresponding to a main power amplifier link and/or an auxiliary power amplifier link of the Doherty power amplifier circuit, performing phase modulation on signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit; alternatively, the first and second electrodes may be,
before the frequency conversion processing is carried out on the baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, the phase modulation is carried out on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the number of auxiliary power amplifiers of the doherty power amplifier circuit is one or more; and, if the number of the auxiliary power amplifiers of the doherty power amplifier circuit is plural, then the phase modulation is performed on the signal of the auxiliary power amplifier link of the doherty power amplifier circuit, including:
and performing phase modulation on signals of all auxiliary power amplification links of the Doherty power amplification circuit.
With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the envelope control circuit includes an envelope modulator respectively connected to each power amplifier in the doherty power amplifier circuit, and the envelope modulator is configured to output an envelope voltage to each power amplifier in the doherty power amplifier circuit; alternatively, the first and second electrodes may be,
the multi-power amplifier circuit comprises a plurality of envelope modulators which are correspondingly connected with each power amplifier in the Doherty power amplifier circuit one by one, wherein each envelope modulator in the plurality of envelope modulators is used for outputting envelope voltage to the corresponding power amplifier in the Doherty power amplifier circuit.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the phase modulation is digital phase modulation or analog phase modulation.
In a second aspect, a power amplifier control device is provided, which is suitable for a power amplifier system including an envelope control circuit and a doherty power amplifier circuit, wherein the envelope control circuit includes an envelope modulator for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage as a supply voltage to the doherty power amplifier circuit; doherty power amplifier circuit includes main power amplifier and auxiliary power amplifier, main power amplifier, auxiliary power amplifier are used for carrying out amplification treatment according to the envelope voltage of envelope modulator output respectively to the baseband signal of baseband unit output, the device includes:
the signal generating unit is used for generating a phase modulation control signal according to the envelope signal output by the baseband unit;
and the signal phase modulation unit is used for performing phase modulation on signals of a main power amplification link and/or an auxiliary power amplification link of the Doherty power amplification circuit according to the generated phase modulation control signal, so that the phase difference between the phase-modulated signals of the main power amplification link and the auxiliary power amplification link is a set value corresponding to the current value of the envelope signal, and the set value is the optimal phase value of the Doherty power amplification circuit when the power supply voltage of the Doherty power amplification circuit is the envelope voltage corresponding to the current value of the envelope signal.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the signal generating unit is specifically configured to generate a first phase modulation control signal according to an envelope signal if it is determined that a current value of the envelope signal is not greater than a set envelope starting threshold; the first phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a first phase value, and the first phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the minimum envelope voltage; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be the set maximum value of the envelope signal, generating a second phase modulation control signal according to the envelope signal; the second phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link to be a second phase value, and the second phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the maximum envelope voltage; wherein the set envelope signal maximum is greater than the set envelope turn-on threshold; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be larger than the set envelope starting threshold value and smaller than the set maximum value of the envelope signal, generating a third phase modulation control signal according to the envelope signal; the third phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplification link and the phase-modulated signal of the auxiliary power amplification link to be a third phase value; and the third phase value is obtained by performing linear interpolation operation according to the current value of the envelope signal, the first phase value, the second phase value, the envelope opening threshold value corresponding to the first phase value and the envelope signal maximum value corresponding to the second phase value.
With reference to the second aspect, in a second possible implementation manner of the second aspect, the signal phase modulation unit is specifically configured to perform phase modulation on a signal of a main power amplifier link and/or an auxiliary power amplifier link of a doherty power amplifier circuit after performing frequency conversion processing on a baseband signal corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit; alternatively, the first and second electrodes may be,
before the frequency conversion processing is carried out on the baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, the phase modulation is carried out on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit.
With reference to the second aspect, in a third possible implementation manner of the second aspect, the number of auxiliary power amplifiers of the doherty power amplifier circuit is one or more;
the signal phase modulation unit is specifically used for performing phase modulation on signals of each auxiliary power amplification link of the Doherty power amplification circuit when the number of the auxiliary power amplifiers of the Doherty power amplification circuit is multiple and the signals of the auxiliary power amplification links of the Doherty power amplification circuit need to be phase-modulated.
With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the envelope control circuit includes an envelope modulator respectively connected to each power amplifier in the doherty power amplifier circuit, and the envelope modulator is configured to output an envelope voltage to each power amplifier in the doherty power amplifier circuit; alternatively, the first and second electrodes may be,
the multi-power amplifier circuit comprises a plurality of envelope modulators which are correspondingly connected with each power amplifier in the Doherty power amplifier circuit one by one, wherein each envelope modulator in the plurality of envelope modulators is used for outputting envelope voltage to the corresponding power amplifier in the Doherty power amplifier circuit.
With reference to the second aspect, in a fifth possible implementation manner of the second aspect, the phase modulation is digital phase modulation or analog phase modulation.
In a third aspect, a power amplifier control device is provided, which is suitable for a power amplifier system including an envelope control circuit and a doherty power amplifier circuit, wherein the envelope control circuit includes an envelope modulator for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage as a supply voltage to the doherty power amplifier circuit; doherty power amplifier circuit includes main power amplifier and auxiliary power amplifier, main power amplifier, auxiliary power amplifier are used for carrying out amplification treatment according to the envelope voltage of envelope modulator output respectively to the baseband signal of baseband unit output, the device includes:
the signal generator is used for generating a phase modulation control signal according to the envelope signal output by the baseband unit;
and the signal modulator is used for performing phase modulation on signals of the main power amplification link and/or the auxiliary power amplification link of the Doherty power amplification circuit according to the generated phase modulation control signal, so that the phase difference between the phase-modulated signals of the main power amplification link and the auxiliary power amplification link is a set value corresponding to the current value of the envelope signal, and the set value is the optimal phase value of the Doherty power amplification circuit when the power supply voltage of the Doherty power amplification circuit is the envelope voltage corresponding to the current value of the envelope signal.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the signal generator is specifically configured to generate a first phase modulation control signal according to the envelope signal if it is determined that a current value of the envelope signal is not greater than a set envelope starting threshold; the first phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a first phase value, and the first phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the minimum envelope voltage; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be the set maximum value of the envelope signal, generating a second phase modulation control signal according to the envelope signal; the second phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link to be a second phase value, and the second phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the maximum envelope voltage; wherein the set envelope signal maximum is greater than the set envelope turn-on threshold; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be larger than the set envelope starting threshold value and smaller than the set maximum value of the envelope signal, generating a third phase modulation control signal according to the envelope signal; the third phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplification link and the phase-modulated signal of the auxiliary power amplification link to be a third phase value; and the third phase value is obtained by performing linear interpolation operation according to the current value of the envelope signal, the first phase value, the second phase value, the envelope opening threshold value corresponding to the first phase value and the envelope signal maximum value corresponding to the second phase value.
With reference to the third aspect, in a second possible implementation manner of the third aspect, the signal modulator is specifically configured to perform frequency conversion processing on a baseband signal corresponding to a main power amplifier link and/or an auxiliary power amplifier link of a doherty power amplifier circuit, and then perform phase modulation on a signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit; alternatively, the first and second electrodes may be,
before the frequency conversion processing is carried out on the baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, the phase modulation is carried out on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit.
With reference to the third aspect, in a third possible implementation manner of the third aspect, the number of auxiliary power amplifiers of the doherty power amplifier circuit is one or more;
the signal modulator is specifically configured to phase modulate signals of each auxiliary power amplifier link of the doherty power amplifier circuit when the number of the auxiliary power amplifiers of the doherty power amplifier circuit is multiple and the signals of the auxiliary power amplifier links of the doherty power amplifier circuit need to be phase modulated.
With reference to the third aspect, in a fourth possible implementation manner of the third aspect, the envelope control circuit includes an envelope modulator respectively connected to each power amplifier in the doherty power amplifier circuit, and the envelope modulator is configured to output an envelope voltage to each power amplifier in the doherty power amplifier circuit; alternatively, the first and second electrodes may be,
the multi-power amplifier circuit comprises a plurality of envelope modulators which are correspondingly connected with each power amplifier in the Doherty power amplifier circuit one by one, wherein each envelope modulator in the plurality of envelope modulators is used for outputting envelope voltage to the corresponding power amplifier in the Doherty power amplifier circuit.
With reference to the third aspect, in a fifth possible implementation manner of the third aspect, the phase modulation is digital phase modulation or analog phase modulation.
In a fourth aspect, a power amplifier control system is provided, which includes a power amplifier system including an envelope control circuit and a doherty power amplifier circuit, wherein the envelope control circuit includes an envelope modulator for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage as a supply voltage to the doherty power amplifier circuit; the Doherty power amplifier circuit comprises a main power amplifier and an auxiliary power amplifier, wherein the main power amplifier and the auxiliary power amplifier are respectively used for amplifying baseband signals output by a baseband unit according to envelope voltage output by an envelope modulator, and the power amplifier control system further comprises a second aspect or a power amplifier control device in any one of first to fifth possible implementation manners of the second aspect.
According to the power amplifier control method, device and system provided in the first to fourth aspects, a phase modulation control signal can be generated according to the envelope signal output by the baseband unit, and the phase modulation control signal is used to perform phase modulation on the signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit, so that the phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link is a set value corresponding to the current value of the envelope signal, and the set value is the optimal phase value of the doherty power amplifier circuit when the supply voltage of the doherty power amplifier circuit is the envelope voltage corresponding to the current value of the envelope signal. Namely, the phase compensation can be performed on the main power amplifier link and/or the auxiliary power amplifier link according to different envelope voltages, so that the phase difference between the main power amplifier link and the auxiliary power amplifier link of the doherty power amplifier circuit can be optimal under different envelope voltages, and the effect and performance of the power amplifier are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional ET power amplifier in the prior art;
fig. 2 is a schematic structural diagram of a separately fed Doherty ET power amplifier in the prior art;
fig. 3 is a schematic structural diagram of a separately fed Doherty ET power amplifier in the prior art;
fig. 4 is a schematic flow chart illustrating a power amplifier control method according to a first embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a relationship curve between a phase difference between a signal of the main power amplifier link and a signal of the auxiliary power amplifier link and an envelope signal according to a first embodiment of the present invention;
fig. 6 is a first schematic structural diagram of the power amplifier system according to the first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a power amplifier system according to the first embodiment of the present invention;
fig. 8 is a schematic structural diagram of a power amplifier system according to the first embodiment of the present invention;
fig. 9 is a schematic structural diagram of the power amplifier control device according to the second embodiment of the present invention;
fig. 10 is a schematic diagram of a power amplifier control structure according to a second embodiment of the present invention;
fig. 11 is a schematic diagram of a power amplifier control structure according to a second embodiment of the present invention;
fig. 12 is a schematic diagram of a power amplifier control structure according to the second embodiment of the present invention;
fig. 13 is a schematic diagram of a power amplifier control structure according to the second embodiment of the present invention;
fig. 14 is a schematic diagram of a power amplifier control structure according to the second embodiment of the present invention;
fig. 15 is a schematic structural diagram of the power amplifier control device according to the third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
in order to solve the problems of poor effect, poor performance and the like in the conventional high-efficiency power amplifier technology, an embodiment of the present invention provides a power amplifier control method, which is a schematic flow diagram of the power amplifier control method in the embodiment of the present invention, as shown in fig. 4, and the power amplifier control method is applicable to a power amplifier system including an envelope control circuit and a doherty power amplifier circuit, wherein the envelope control circuit includes an envelope modulator for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage as a supply voltage to the doherty power amplifier circuit; the doherty power amplifier circuit comprises a main power amplifier and an auxiliary power amplifier, wherein the main power amplifier and the auxiliary power amplifier are respectively used for amplifying baseband signals output by a baseband unit according to envelope voltage output by an envelope modulator, and specifically, the control method comprises the following steps:
step 401: generating a phase modulation control signal according to the envelope signal output by the baseband unit;
step 402: and performing phase modulation on signals of a main power amplifier link and/or an auxiliary power amplifier link of the Doherty power amplifier circuit according to the generated phase modulation control signal, so that the phase difference between the signals of the main power amplifier link and the auxiliary power amplifier link after phase modulation is a set value corresponding to the current value of the envelope signal, and the set value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the envelope voltage corresponding to the current value of the envelope signal.
That is, when the doherty power amplifier circuit is phase-modulated according to the generated phase modulation control signal, only the signal of the main power amplifier link can be phase-modulated, and the phase of the signal of the auxiliary power amplifier link is kept unchanged; or only phase modulating is carried out on the signals of the auxiliary power amplification link, and the phase of the signals of the main power amplification link is kept unchanged; or simultaneously phase modulating the signals of the main power amplifier link and the signals of the auxiliary power amplifier link; that is, the power amplifier link that needs phase modulation can be selected according to actual requirements, as long as it is ensured that the phase difference between the signal of the doherty main power amplifier link and the signal of the auxiliary power amplifier link reaches the required value, which is not described in detail herein.
According to the embodiment of the invention, the generated phase modulation control signal is used for performing phase modulation on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, so that the phase difference between the signals of the main power amplifier link and the auxiliary power amplifier link of the Doherty power amplifier circuit reaches the optimal phase of the Doherty power amplifier circuit under the envelope voltage value corresponding to the current envelope signal, namely, the phase compensation can be performed on the main power amplifier link and/or the auxiliary power amplifier link aiming at different envelope voltages, so that the phase difference between the main power amplifier link and the auxiliary power amplifier link can reach the corresponding optimal value under different envelope voltages, the power amplifier effect and performance are improved, and the problems of poor effect, poor performance and the like existing in the existing high-efficiency power amplifier technology are solved.
Optionally, the generating a phase modulation control signal according to the envelope signal output by the baseband unit in step 401 may include:
if the current value of the envelope signal is not larger than the set envelope starting threshold value, generating a first phase modulation control signal according to the envelope signal; the first phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a first phase value, and the first phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the minimum envelope voltage; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be the set maximum value of the envelope signal, generating a second phase modulation control signal according to the envelope signal; the second phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link to be a second phase value, and the second phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the maximum envelope voltage; wherein the set envelope signal maximum is greater than the set envelope turn-on threshold; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be larger than the set envelope starting threshold value and smaller than the set maximum value of the envelope signal, generating a third phase modulation control signal according to the envelope signal; the third phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplification link and the phase-modulated signal of the auxiliary power amplification link to be a third phase value; and the third phase value is obtained by performing linear interpolation operation according to the current value of the envelope signal, the first phase value, the second phase value, the envelope opening threshold value corresponding to the first phase value and the envelope signal maximum value corresponding to the second phase value. That is, when the envelope signal varies between the set envelope-on threshold and the set maximum value of the envelope signal, a phase modulation control signal may be generated such that the phase difference between the signal of the main power amplifier link and the signal of the auxiliary power amplifier link varies linearly with the envelope signal.
It should be noted that the first phase value is the optimal phase value of the Doherty power amplifier circuit at the time of the minimum envelope voltage because, when the current value of the envelope signal is not greater than the set envelope opening threshold (the threshold can be flexibly adjusted according to the actual situation), the power amplifier system works in the pure Doherty state, and the envelope modulator outputs a fixed voltage VDDL (i.e., the minimum envelope voltage) to be supplied to the drain of each power amplifier in the Doherty power amplifier circuit;
similarly, the reason why the second phase value is the optimal phase value of the Doherty power amplifier circuit at the maximum envelope voltage is that when the envelope signal is greater than the set envelope opening threshold, the power amplifier system operates in the common state of Doherty and ET, the output voltage of the envelope modulator will change along with the envelope of the envelope signal, and when the envelope signal reaches the maximum value, that is, the set maximum value of the envelope signal is reached, the envelope modulator will output a maximum output voltage VDDH (that is, the maximum envelope voltage) to be supplied to the drain stage of each power amplifier in the Doherty power amplifier circuit, which is not described herein again.
Optionally, in the embodiment of the present invention, the generated phase modulation control signal may specifically be a voltage signal; for example, if the doherty power amplifier circuit includes a main power amplifier and an auxiliary power amplifier, and a signal of an auxiliary power amplifier link in the doherty power amplifier circuit needs to be phase-modulated, then:
when the envelope signal is not greater than the set envelope opening threshold, the envelope modulator outputs a fixed voltage VDDL (i.e., the minimum envelope voltage) to be provided to the drain of each power amplifier in the doherty power amplifier circuit, and meanwhile, the power amplifier control device (i.e., the execution main body of each step in the embodiment of the present invention) generates a fixed voltage V0 according to the envelope signal output by the baseband unit, where the fixed voltage V0 enables the phase of the auxiliary power amplifier link to be in a phase a state, i.e., the phase difference between the main power amplifier link and the auxiliary power amplifier link of the doherty power amplifier circuit is a, and the phase a is the optimal phase of the doherty power amplifier circuit under the voltage VDDL;
when the envelope signal is greater than the set envelope opening threshold, the voltage output by the envelope modulator can change along with the envelope of the envelope signal, the maximum envelope corresponds to the maximum output voltage VDDH (namely, the maximum envelope voltage), meanwhile, the voltage signal generated by the power amplifier control device according to the envelope signal output by the baseband unit can also change along with the change of the envelope, and when the envelope signal reaches the maximum, the voltage V1 output by the power amplifier control device can enable the phase of the auxiliary power amplifier link to be in a phase b state, namely, the phase difference between the main power amplifier link and the auxiliary power amplifier link of the Doherty power amplifier circuit is b, and the phase b is the optimal phase of the Doherty power amplifier circuit under the voltage VDDH; when the envelope signal changes between the set envelope starting threshold and the set maximum value of the envelope signal, the power amplifier control device generates a voltage according to the envelope signal output by the baseband unit, so that the phase of the auxiliary power amplifier link linearly changes along with the envelope signal, and a specific change curve can be shown in fig. 5.
Optionally, the phase modulating the signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit according to the generated phase modulating control signal in step 402 includes:
after performing frequency conversion processing on baseband signals corresponding to a main power amplifier link and/or an auxiliary power amplifier link of the Doherty power amplifier circuit, performing phase modulation on signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit; alternatively, the first and second electrodes may be,
before the frequency conversion processing is carried out on the baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, the phase modulation is carried out on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit.
That is, for one or more signals requiring phase modulation, the phase modulation operation may be performed after the frequency conversion or before the frequency conversion, which is not limited in this embodiment of the present invention.
For example, assuming that a signal of an auxiliary power amplifier link in the doherty power amplifier circuit needs to be phase-modulated, the up-conversion device may perform frequency conversion processing on a baseband signal generated by the baseband unit to obtain multiple radio frequency signals corresponding to each power amplifier in the doherty power amplifier circuit one by one, and then perform phase modulation on the radio frequency signals corresponding to the auxiliary power amplifier link; at this time, in order to simplify the system structure and reduce the number of the up-conversion devices, the baseband unit may only output one path of baseband signal to the power amplifier system, and certainly, may also output multiple paths of baseband signals corresponding to each power amplifier in the doherty power amplifier circuit one to one, and the present disclosure is not limited herein; alternatively, the first and second electrodes may be,
or the baseband signal generated by the baseband unit and needing to be input to the auxiliary power amplifier link of the Doherty power amplifier circuit is subjected to phase modulation before the baseband signal generated by the baseband unit is subjected to frequency conversion processing by the up-conversion equipment; at this time, the baseband unit can output multiple paths of baseband signals corresponding to each power amplifier in the doherty power amplifier circuit one by one, or only output two paths of baseband signals, wherein one path of baseband signal corresponds to the main power amplifier link, and the other path of baseband signal corresponds to all auxiliary power amplifier links; in addition, it should be noted that the phase modulation of the baseband signal corresponding to the auxiliary power amplifier link may be completed in the process of generating the corresponding baseband signal by the baseband unit (that is, at this time, the power amplifier control device may be integrated inside the baseband unit and exist as a subunit of the baseband unit), or may be completed after the baseband unit generates the corresponding baseband signal and before the baseband signal is subjected to the frequency conversion processing, which is not described herein again.
Further, the number of the auxiliary power amplifiers of the doherty power amplifier circuit is one (as shown in fig. 6) or more (as shown in fig. 7); and, if the number of the auxiliary power amplifiers of the doherty power amplifier circuit is plural, then the phase modulation is performed on the signal of the auxiliary power amplifier link of the doherty power amplifier circuit, including:
and performing phase modulation on signals of all auxiliary power amplification links of the Doherty power amplification circuit.
For example, if the doherty power amplifier circuit comprises a main power amplifier and N (the value of N is a positive integer greater than 1) auxiliary power amplifiers, if the signals of the main power amplifier link and the signals of the auxiliary power amplifier link of the doherty power amplifier circuit need to be phase-modulated, the signals of the main power amplifier link are phase-modulated, and the signals of each auxiliary power amplifier link are phase-modulated, so that the phase difference between the phase-modulated signals of the main power amplifier link and the phase-modulated signals of each auxiliary power amplifier link is a set value corresponding to the current value of the envelope signal, which is not described herein again.
It should be noted that the more auxiliary power amplifiers are in the doherty power amplifier circuit, the larger the output power of the doherty power amplifier circuit is, and therefore, in practical application, according to practical requirements, the doherty power amplifier circuit (i.e. the multistage doherty power amplifier circuit) with a plurality of auxiliary power amplifiers can be adopted to achieve high requirements for power, which is not described in detail in the embodiment of the present invention.
Furthermore, the number of envelope modulators in the envelope control circuit is one or more; and, when there is one envelope modulator in the envelope control circuit, the envelope modulator may be connected to each power amplifier in the doherty power amplifier circuit, respectively, so as to output an envelope voltage to each power amplifier in the doherty power amplifier circuit, which may be specifically shown in fig. 6 and 7; alternatively, the first and second electrodes may be,
when the envelope modulator in the envelope control circuit is multiple, for example, the envelope control circuit includes multiple envelope modulators connected to respective power amplifiers in the doherty power amplifier circuit in a one-to-one correspondence manner, each envelope modulator in the multiple envelope modulators may be configured to output an envelope voltage to a corresponding power amplifier in the doherty power amplifier circuit, which may be specifically shown in fig. 8.
It should be noted that, when there are a plurality of envelope modulators in the envelope control circuit, each envelope modulator in the plurality of envelope modulators may correspond to a plurality of power amplifiers in addition to a unique power amplifier, and details thereof are not repeated here.
In addition, as shown in fig. 6 or fig. 7, the doherty power amplifier circuit according to the embodiment of the present invention may include a main power amplifier and an auxiliary power amplifier, and may further include a driver power amplifier for providing a driving signal to each power amplifier, and a quarter-wavelength transmission line, which are not described herein again.
Further, the phase modulation is digital phase modulation or analog phase modulation.
Specifically, the digital Phase modulation may include Quadrature Phase Shift Keying (QPSK) and the like, and the analog Phase modulation may include loop parameter Phase Shift, RC network Phase Shift, and variable delay method Phase Shift and the like, which are not described herein again.
That is to say, the phase modulation mode can be flexibly selected according to the actual requirement, and the flexibility of power amplifier control is further improved.
The embodiment of the invention provides a power amplifier control method, which is suitable for a power amplifier system comprising an envelope control circuit and a Doherty power amplifier circuit, and can generate a phase modulation control signal according to an envelope signal output by a baseband unit, and phase modulate signals of a main power amplifier link and/or an auxiliary power amplifier link of the Doherty power amplifier circuit according to the phase modulation control signal, so that the phase difference between the phase modulated signals of the main power amplifier link and the auxiliary power amplifier link is a set value corresponding to the current value of the envelope signal, and the set value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the envelope voltage corresponding to the current value of the envelope signal. Namely, the phase compensation can be carried out on the main power amplifier link and/or the auxiliary power amplifier link according to different envelope voltages, so that the phase difference between the main power amplifier link and the auxiliary power amplifier link can reach the optimal value under different envelope voltages, the Doherty backspacing efficiency advantage can be fully utilized, the power amplifier performance is further improved by adjusting the phases under different voltages on the basis of improving the saturated power of the power amplifier by combining the ET function, and the problems of poor effect, poor performance and the like in the existing high-efficiency power amplifier technology are solved.
Example two:
based on the same inventive concept as the first embodiment of the present invention, the second embodiment of the present invention provides a power amplifier control device, which is suitable for a power amplifier system including an envelope control circuit and a doherty power amplifier circuit, wherein the envelope control circuit includes an envelope modulator for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage as a supply voltage to the doherty power amplifier circuit; doherty power amplifier circuit includes main power amplifier and supplementary power amplifier, main power amplifier, supplementary power amplifier are used for carrying out amplification processing to the baseband signal of baseband unit output according to the envelope voltage of envelope modulator output respectively, specifically, can be as shown in figure 9, the device can include:
a signal generating unit 91, configured to generate a phase modulation control signal according to the envelope signal output by the baseband unit;
and a signal phasing unit 92, configured to phase modulate a signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit according to the phase modulation control signal generated by the signal generating unit 91, so that a phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link is a set value corresponding to a current value of the envelope signal, where the set value is an optimal phase value of the doherty power amplifier circuit when a supply voltage of the doherty power amplifier circuit is the envelope voltage corresponding to the current value of the envelope signal.
That is, the phase modulation control signal may be generated by the signal generating unit 91, and the phase modulation control signal may be output to the signal phase modulating unit 92 to perform phase modulation on the signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit, so that the phase difference between the signal of the main power amplifier link and the signal of the auxiliary power amplifier link of the doherty power amplifier circuit may reach the optimal phase of the doherty power amplifier circuit under the envelope voltage value corresponding to the current envelope signal. Namely, the phase compensation can be performed on the main power amplifier link and/or the auxiliary power amplifier link according to different envelope voltages, so that the phase difference between the main power amplifier link and the auxiliary power amplifier link can reach a corresponding optimal value under different envelope voltages, the effect and the performance of the power amplifier are improved, and the problems of poor effect, poor performance and the like in the existing high-efficiency power amplifier technology are solved.
Optionally, the signal generating unit 91 is specifically configured to generate a first phase modulation control signal according to the envelope signal if it is determined that the current value of the envelope signal is not greater than a set envelope starting threshold; the first phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a first phase value, and the first phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the minimum envelope voltage; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be the set maximum value of the envelope signal, generating a second phase modulation control signal according to the envelope signal; the second phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link to be a second phase value, and the second phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the maximum envelope voltage; wherein the set envelope signal maximum is greater than the set envelope turn-on threshold; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be larger than the set envelope starting threshold value and smaller than the set maximum value of the envelope signal, generating a third phase modulation control signal according to the envelope signal; the third phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplification link and the phase-modulated signal of the auxiliary power amplification link to be a third phase value; and the third phase value is obtained by performing linear interpolation operation according to the current value of the envelope signal, the first phase value, the second phase value, the envelope opening threshold value corresponding to the first phase value and the envelope signal maximum value corresponding to the second phase value. That is, when the envelope signal varies between the set envelope-on threshold and the set maximum value of the envelope signal, the signal generating unit 91 may generate a phase modulation control signal such that the phase difference between the signal of the main power amplifier link and the signal of the auxiliary power amplifier link linearly varies following the envelope signal.
It should be noted that the first phase value is the optimal phase value of the Doherty power amplifier circuit at the time of the minimum envelope voltage because, when the current value of the envelope signal is not greater than the set envelope opening threshold (the threshold can be flexibly adjusted according to the actual situation), the power amplifier system works in the pure Doherty state, and the envelope modulator outputs a fixed voltage VDDL (i.e., the minimum envelope voltage) to be supplied to the drain of each power amplifier in the Doherty power amplifier circuit;
similarly, the reason why the second phase value is the optimal phase value of the Doherty power amplifier circuit at the maximum envelope voltage is that when the envelope signal is greater than the set envelope opening threshold, the power amplifier system operates in the common state of Doherty and ET, the output voltage of the envelope modulator will change along with the envelope of the envelope signal, and when the envelope signal reaches the maximum value, that is, the set maximum value of the envelope signal is reached, the envelope modulator will output a maximum output voltage VDDH (that is, the maximum envelope voltage) to be supplied to the drain stage of each power amplifier in the Doherty power amplifier circuit, which is not described herein again.
Optionally, the signal phase modulation unit 92 is specifically configured to perform frequency conversion processing on a baseband signal corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit, and then perform phase modulation on a signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit; alternatively, the first and second electrodes may be,
before the frequency conversion processing is carried out on the baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, the phase modulation is carried out on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit.
That is, for one or more signals requiring phase modulation, the phase modulation operation may be performed after the frequency conversion or before the frequency conversion, which is not limited in this embodiment of the present invention.
For example, as shown in fig. 10, assuming that a signal of an auxiliary power amplifier link in the doherty power amplifier circuit needs to be phase-modulated, the up-conversion device may perform frequency conversion processing on a baseband signal generated by the baseband unit to obtain multiple radio frequency signals corresponding to each power amplifier in the doherty power amplifier circuit one by one, and then perform phase modulation on the radio frequency signals corresponding to the auxiliary power amplifier link; at this time, in order to simplify the system structure and reduce the number of the up-conversion devices, the baseband unit may only output one path of baseband signal to the power amplifier system, and certainly, may also output multiple paths of baseband signals corresponding to each power amplifier in the doherty power amplifier circuit one to one, and the present disclosure is not limited herein; alternatively, the first and second electrodes may be,
as shown in fig. 11, before the up-conversion device performs the frequency conversion processing on the baseband signal generated by the baseband unit, the baseband signal generated by the baseband unit and required to be input to the auxiliary power amplifier link of the doherty power amplifier circuit may be subjected to phase modulation; at this time, the baseband unit can output multiple paths of baseband signals corresponding to each power amplifier in the doherty power amplifier circuit one by one, or only output two paths of baseband signals, wherein one path of baseband signal corresponds to the main power amplifier link, and the other path of baseband signal corresponds to all auxiliary power amplifier links; in addition, it should be noted that the phase modulation of the baseband signal corresponding to the auxiliary power amplifier link may be completed in the process of generating the corresponding baseband signal by the baseband unit (that is, at this time, the power amplifier control device may be integrated inside the baseband unit and exist as a subunit of the baseband unit), or may be completed after the baseband unit generates the corresponding baseband signal and before the baseband signal is subjected to the frequency conversion processing, which is not described herein again.
Furthermore, the number of the auxiliary power amplifiers of the Doherty power amplifier circuit is one or more; the signal phase modulation unit 92 is specifically configured to phase modulate signals of each auxiliary power amplifier link of the doherty power amplifier circuit when the number of the auxiliary power amplifiers of the doherty power amplifier circuit is multiple and the phase of the signals of the auxiliary power amplifier link of the doherty power amplifier circuit needs to be modulated.
For example, if the doherty power amplifier circuit comprises a main power amplifier and N (the value of N is a positive integer greater than 1) auxiliary power amplifiers, if the signals of the main power amplifier link and the signals of the auxiliary power amplifier link of the doherty power amplifier circuit need to be phase-modulated, the signals of the main power amplifier link are phase-modulated, and the signals of each auxiliary power amplifier link are phase-modulated, so that the phase difference between the phase-modulated signals of the main power amplifier link and the phase-modulated signals of each auxiliary power amplifier link is a set value corresponding to the current value of the envelope signal, which is not described herein again.
It should be noted that the more auxiliary power amplifiers are in the doherty power amplifier circuit, the larger the output power of the doherty power amplifier circuit is, and therefore, in practical application, according to practical requirements, the doherty power amplifier circuit (i.e. the multistage doherty power amplifier circuit) with a plurality of auxiliary power amplifiers can be adopted to achieve high requirements for power, which is not described in detail in the embodiment of the present invention.
Further, it should be noted that the signal generating unit 91 may include one or more small signal modulators; signal phasing unit 92 may include one or more phasing circuits.
For example, when only the phase of the signal of the main power amplifier link needs to be modulated, or only the phase of the signal of the auxiliary power amplifier link needs to be modulated, as shown in fig. 12 (taking the power amplifier link that needs to be modulated as the auxiliary power amplifier link as an example), the signal generating unit 91 may include a small signal modulator, and the signal modulating unit 92 may include a phase modulating circuit corresponding to the small signal modulator, where the small signal modulator is configured to generate a phase modulating control signal according to the envelope signal generated by the baseband unit, and output the phase modulating control signal to the phase modulating circuit; the phase modulation circuit is used for adjusting the phase of the corresponding power amplifier link to a set phase according to the phase modulation control signal output by the small signal modulator; alternatively, the first and second electrodes may be,
when it is required to phase-modulate signals of the main power amplifier link and the auxiliary power amplifier link at the same time, as shown in fig. 13, the signal generating unit 91 may include a first small signal modulator for generating a first sub-phase modulation control signal corresponding to the main power amplifier link, and a second small signal modulator for generating a second sub-phase modulation control signal corresponding to the auxiliary power amplifier link; the signal phasing unit 92 may include a first phasing circuit corresponding to the first small signal modulator for phasing a phase of a signal corresponding to the main power amplification link to a first sub-phase, and a second phasing circuit corresponding to the second small signal modulator for phasing a phase of a signal corresponding to the auxiliary power amplification link to a second sub-phase, wherein a phase difference between the first sub-phase and the second sub-phase is a set value.
It should be noted that, when a plurality of auxiliary power amplifiers are provided and phase modulation needs to be performed on the auxiliary power amplifier link, as shown in fig. 14 (for example, only phase modulation is performed on signals of the auxiliary power amplifier link), the signal generating unit 91 may include a plurality of small signal modulators (e.g., small signal modulator 1 to small signal modulator N shown in fig. 14) corresponding to the plurality of auxiliary power amplifiers one to one, and the signal phase modulating unit 92 may include a plurality of phase modulating circuits (e.g., phase modulating circuit 1 to phase modulating circuit N shown in fig. 14) corresponding to the plurality of auxiliary power amplifiers one to one, which is not described herein again.
That is to say, the number of small signal modulators in the signal generating unit 91 and the number of phase modulating circuits in the signal phase modulating unit 92 can be flexibly set according to the actual situation, as long as the phase difference between the signal of the main power amplifying link and the signal of the auxiliary power amplifying link in the doherty power amplifying circuit is ensured to be the set value, which is not described herein again.
Furthermore, the number of envelope modulators in the envelope control circuit is one or more; and, when there is one envelope modulator in the envelope control circuit, the envelope modulator may be connected to each power amplifier in the doherty power amplifier circuit, respectively, so as to output an envelope voltage to each power amplifier in the doherty power amplifier circuit, which may be specifically as shown in fig. 7; alternatively, the first and second electrodes may be,
when the envelope modulator in the envelope control circuit is multiple, for example, the envelope control circuit includes multiple envelope modulators connected to respective power amplifiers in the doherty power amplifier circuit in a one-to-one correspondence manner, each envelope modulator in the multiple envelope modulators may be configured to output an envelope voltage to a corresponding power amplifier in the doherty power amplifier circuit, which may be specifically shown in fig. 8.
In addition, it should be noted that, when there are a plurality of envelope modulators in the envelope control circuit, each of the envelope modulators may correspond to a plurality of power amplifiers in addition to a unique power amplifier, and details thereof are not repeated herein.
Further, the phase modulation is digital phase modulation or analog phase modulation.
Specifically, the digital Phase modulation may include Quadrature Phase Shift Keying (QPSK) and the like, and the analog Phase modulation may include loop parameter Phase Shift, RC network Phase Shift, and variable delay method Phase Shift and the like, which are not described herein again.
That is to say, the modulation mode can be flexibly selected according to the actual requirement, and the flexibility of power amplifier control is further improved.
In addition, it should be noted that the power amplifier control device described in the embodiment of the present invention may exist generally independent of devices such as a baseband unit; of course, it may exist independently from devices such as the baseband unit, and may also exist as a sub-unit of the baseband unit integrated inside the baseband unit, as shown in fig. 11, which is not described herein again.
Example three:
based on the same inventive concept as the first embodiment and the second embodiment of the present invention, the third embodiment of the present invention further provides another power amplifier control device, which is suitable for a power amplifier system including an envelope control circuit and a doherty power amplifier circuit, wherein the envelope control circuit includes an envelope modulator for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage as a supply voltage to the doherty power amplifier circuit; doherty power amplifier circuit includes main power amplifier and supplementary power amplifier, main power amplifier, supplementary power amplifier are used for carrying out amplification processing to the baseband signal of baseband unit output according to the envelope voltage of envelope modulator output respectively, specifically, can be as shown in figure 15, the device can include:
a signal generator 151 operable to generate a phase modulation control signal from the envelope signal output from the baseband unit;
the signal modulator 152 may be configured to perform phase modulation on a signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit according to the phase modulation control signal generated by the signal generator 151, so that a phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link is a set value corresponding to a current value of the envelope signal, where the set value is an optimal phase value of the doherty power amplifier circuit when the supply voltage of the doherty power amplifier circuit is the envelope voltage corresponding to the current value of the envelope signal.
That is, the phase modulation control signal may be generated by the signal generator 151 and output to the signal modulator 152 to phase modulate the signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit, so that the phase difference between the signal of the main power amplifier link and the signal of the auxiliary power amplifier link of the doherty power amplifier circuit reaches the optimal phase of the doherty power amplifier circuit at the envelope voltage value corresponding to the current envelope signal. Namely, the phase compensation can be performed on the main power amplifier link and/or the auxiliary power amplifier link according to different envelope voltages, so that the phase difference between the main power amplifier link and the auxiliary power amplifier link can reach a corresponding optimal value under different envelope voltages, the effect and the performance of the power amplifier are improved, and the problems of poor effect, poor performance and the like in the existing high-efficiency power amplifier technology are solved.
Optionally, the signal generator 151 is specifically configured to generate a first phase modulation control signal according to the envelope signal if it is determined that a current value of the envelope signal is not greater than a set envelope starting threshold; the first phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a first phase value, and the first phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the minimum envelope voltage; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be the set maximum value of the envelope signal, generating a second phase modulation control signal according to the envelope signal; the second phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplifier link and the phase-modulated signal of the auxiliary power amplifier link to be a second phase value, and the second phase value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the maximum envelope voltage; wherein the set envelope signal maximum is greater than the set envelope turn-on threshold; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be larger than the set envelope starting threshold value and smaller than the set maximum value of the envelope signal, generating a third phase modulation control signal according to the envelope signal; the third phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplification link and the phase-modulated signal of the auxiliary power amplification link to be a third phase value; and the third phase value is obtained by performing linear interpolation operation according to the current value of the envelope signal, the first phase value, the second phase value, the envelope opening threshold value corresponding to the first phase value and the envelope signal maximum value corresponding to the second phase value. That is, when the envelope signal varies between the set envelope-on threshold and the set maximum value of the envelope signal, the signal generator 151 may generate a phase modulation control signal such that the phase difference between the signal of the main power amplifier link and the signal of the auxiliary power amplifier link linearly varies along with the envelope signal.
It should be noted that the first phase value is the optimal phase value of the Doherty power amplifier circuit at the time of the minimum envelope voltage because, when the current value of the envelope signal is not greater than the set envelope opening threshold (the threshold can be flexibly adjusted according to the actual situation), the power amplifier system works in the pure Doherty state, and the envelope modulator outputs a fixed voltage VDDL (i.e., the minimum envelope voltage) to be supplied to the drain of each power amplifier in the Doherty power amplifier circuit;
similarly, the reason why the second phase value is the optimal phase value of the Doherty power amplifier circuit at the maximum envelope voltage is that when the envelope signal is greater than the set envelope opening threshold, the power amplifier system operates in the common state of Doherty and ET, the output voltage of the envelope modulator will change along with the envelope of the envelope signal, and when the envelope signal reaches the maximum value, that is, the set maximum value of the envelope signal is reached, the envelope modulator will output a maximum output voltage VDDH (that is, the maximum envelope voltage) to be supplied to the drain stage of each power amplifier in the Doherty power amplifier circuit, which is not described herein again.
Optionally, the signal modulator 152 is specifically configured to perform frequency conversion processing on a baseband signal corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit, and then perform phase modulation on a signal of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit; alternatively, the first and second electrodes may be,
before the frequency conversion processing is carried out on the baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, the phase modulation is carried out on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit.
That is, for one or more signals requiring phase modulation, the phase modulation operation may be performed after the frequency conversion or before the frequency conversion, which is not limited in this embodiment of the present invention.
For example, assuming that a signal of an auxiliary power amplifier link in the doherty power amplifier circuit needs to be phase-modulated, the up-conversion device may perform frequency conversion processing on a baseband signal generated by the baseband unit to obtain multiple radio frequency signals corresponding to each power amplifier in the doherty power amplifier circuit one by one, and then perform phase modulation on the radio frequency signals corresponding to the auxiliary power amplifier link; at this time, in order to simplify the system structure and reduce the number of the up-conversion devices, the baseband unit may only output one path of baseband signal to the power amplifier system, and certainly, may also output multiple paths of baseband signals corresponding to each power amplifier in the doherty power amplifier circuit one to one, and the present disclosure is not limited herein; alternatively, the first and second electrodes may be,
or the baseband signal generated by the baseband unit and needing to be input to the auxiliary power amplifier link of the Doherty power amplifier circuit is subjected to phase modulation before the baseband signal generated by the baseband unit is subjected to frequency conversion processing by the up-conversion equipment; at this time, the baseband unit can output multiple paths of baseband signals corresponding to each power amplifier in the doherty power amplifier circuit one by one, or only output two paths of baseband signals, wherein one path of baseband signal corresponds to the main power amplifier link, and the other path of baseband signal corresponds to all auxiliary power amplifier links; in addition, it should be noted that the phase modulation of the baseband signal corresponding to the auxiliary power amplifier link may be completed in the process of generating the corresponding baseband signal by the baseband unit (that is, at this time, the power amplifier control device may be integrated inside the baseband unit and exist as a subunit of the baseband unit), or may be completed after the baseband unit generates the corresponding baseband signal and before the baseband signal is subjected to the frequency conversion processing, which is not described herein again.
Furthermore, the number of the auxiliary power amplifiers of the Doherty power amplifier circuit is one or more; the signal modulator 152 is specifically configured to phase modulate signals of each auxiliary power amplifier link of the doherty power amplifier circuit when the number of the auxiliary power amplifiers of the doherty power amplifier circuit is multiple and the signals of the auxiliary power amplifier links of the doherty power amplifier circuit need to be phase modulated.
For example, if the doherty power amplifier circuit comprises a main power amplifier and N (the value of N is a positive integer greater than 1) auxiliary power amplifiers, if the signals of the main power amplifier link and the signals of the auxiliary power amplifier link of the doherty power amplifier circuit need to be phase-modulated, the signals of the main power amplifier link are phase-modulated, and the signals of each auxiliary power amplifier link are phase-modulated, so that the phase difference between the phase-modulated signals of the main power amplifier link and the phase-modulated signals of each auxiliary power amplifier link is a set value corresponding to the current value of the envelope signal, which is not described herein again.
It should be noted that the more auxiliary power amplifiers are in the doherty power amplifier circuit, the larger the output power of the doherty power amplifier circuit is, and therefore, in practical application, according to practical requirements, the doherty power amplifier circuit (i.e. the multistage doherty power amplifier circuit) with a plurality of auxiliary power amplifiers can be adopted to achieve high requirements for power, which is not described in detail in the embodiment of the present invention.
Further, it should be noted that the signal generator 151 may include one or more small signal modulators; signal modulator 152 may include one or more phase modulation circuits.
For example, when only phase modulation is required for the signal of the main power amplifier link, or only phase modulation is required for the signal of the auxiliary power amplifier link, the signal generator 151 may include a small signal modulator, and the signal modulator 152 may include a phase modulation circuit corresponding to the small signal modulator, where the small signal modulator is configured to generate a phase modulation control signal according to the envelope signal generated by the baseband unit, and output the phase modulation control signal to the phase modulation circuit; the phase modulation circuit is used for adjusting the phase of the corresponding power amplifier link to a set phase according to the phase modulation control signal output by the small signal modulator; alternatively, the first and second electrodes may be,
when it is required to phase-modulate signals of the main power amplifier link and the auxiliary power amplifier link at the same time, the signal generator 151 may include a first small signal modulator for generating a first sub-phase modulation control signal corresponding to the main power amplifier link, and a second small signal modulator for generating a second sub-phase modulation control signal corresponding to the auxiliary power amplifier link; the signal modulator 152 may include a first phase modulation circuit corresponding to the first small signal modulator for modulating a phase of a signal corresponding to the main power amplification link to a first sub-phase, and a second phase modulation circuit corresponding to the second small signal modulator for modulating a phase of a signal corresponding to the auxiliary power amplification link to a second sub-phase, wherein a phase difference between the first sub-phase and the second sub-phase is a set value.
It should be noted that, when there are a plurality of auxiliary power amplifiers and the auxiliary power amplifier link needs to be phase-modulated, the signal generator 151 may include a plurality of small signal modulators corresponding to the plurality of auxiliary power amplifiers one to one, and the signal modulator 152 may include a plurality of phase modulation circuits corresponding to the plurality of auxiliary power amplifiers one to one, which is not described herein again.
That is, the number of small signal modulators in the signal generator 151 and the number of phase modulation circuits in the signal modulator 152 can be flexibly set according to actual situations, as long as the phase difference between the signal of the main power amplifier link and the signal of the auxiliary power amplifier link in the doherty power amplifier circuit is ensured to be a set value, which is not described herein again.
Furthermore, the number of envelope modulators in the envelope control circuit is one or more; and, when there is one envelope modulator in the envelope control circuit, the envelope modulator may be connected to each power amplifier in the doherty power amplifier circuit, respectively, so as to output an envelope voltage to each power amplifier in the doherty power amplifier circuit, which may be specifically as shown in fig. 7; alternatively, the first and second electrodes may be,
when the envelope modulator in the envelope control circuit is multiple, for example, the envelope control circuit includes multiple envelope modulators connected to respective power amplifiers in the doherty power amplifier circuit in a one-to-one correspondence manner, each envelope modulator in the multiple envelope modulators may be configured to output an envelope voltage to a corresponding power amplifier in the doherty power amplifier circuit, which may be specifically shown in fig. 8.
In addition, it should be noted that, when there are a plurality of envelope modulators in the envelope control circuit, each of the envelope modulators may correspond to a plurality of power amplifiers in addition to a unique power amplifier, and details thereof are not repeated herein.
Further, the phase modulation is digital phase modulation or analog phase modulation.
Specifically, the digital Phase modulation may include Quadrature Phase Shift Keying (QPSK) and the like, and the analog Phase modulation may include loop parameter Phase Shift, RC network Phase Shift, and variable delay method Phase Shift and the like, which are not described herein again.
That is to say, the modulation mode can be flexibly selected according to the actual requirement, and the flexibility of power amplifier control is further improved.
In addition, it should be noted that the power amplifier control device described in the embodiment of the present invention may exist generally independent of devices such as a baseband unit; of course, it may exist independently from devices such as the baseband unit, and may also exist as a sub-unit of the baseband unit integrated inside the baseband unit, which is not described herein again.
Example four:
the fourth embodiment of the invention provides a power amplifier control system, which comprises a power amplifier system comprising an envelope control circuit and a Doherty power amplifier circuit, wherein the envelope control circuit comprises an envelope modulator which is used for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage to the Doherty power amplifier circuit as a power supply voltage; the doherty power amplifier circuit comprises a main power amplifier and an auxiliary power amplifier, wherein the main power amplifier and the auxiliary power amplifier are respectively used for amplifying baseband signals output by a baseband unit according to envelope voltage output by an envelope modulator, and the power amplifier control system further comprises the power amplifier control device in the second embodiment of the invention or the power amplifier control device in the third embodiment of the invention, which is not described in detail herein.
In addition, as shown in fig. 14, the power amplifier control system according to the embodiment of the present invention may further include a baseband unit for generating a baseband signal and a corresponding envelope signal, and an up-converter for performing frequency conversion processing on the baseband signal, in addition to the power amplifier system including the envelope control circuit and the doherty power amplifier circuit, the power amplifier control device according to the second embodiment of the present invention, or the power amplifier control device according to the third embodiment of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (11)

1. A power amplifier control method is suitable for a power amplifier system comprising an envelope control circuit and a Doherty power amplifier circuit, wherein the envelope control circuit comprises an envelope modulator which is used for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage to the Doherty power amplifier circuit as a power supply voltage; the Doherty power amplifier circuit comprises a main power amplifier and an auxiliary power amplifier, wherein the main power amplifier and the auxiliary power amplifier are respectively used for amplifying baseband signals output by a baseband unit according to envelope voltage output by an envelope modulator, and the Doherty power amplifier circuit is characterized in that the method comprises the following steps:
generating a phase modulation control signal according to the envelope signal output by the baseband unit;
performing phase modulation on signals of a main power amplifier link and/or an auxiliary power amplifier link of the Doherty power amplifier circuit according to the generated phase modulation control signal, so that the phase difference between the signals of the main power amplifier link and the auxiliary power amplifier link after phase modulation is a set value corresponding to the current value of the envelope signal, and the set value is the optimal phase value of the Doherty power amplifier circuit when the power supply voltage of the Doherty power amplifier circuit is the envelope voltage corresponding to the current value of the envelope signal;
if the current value of the envelope signal is not larger than the set envelope starting threshold value, generating a first phase modulation control signal according to the envelope signal; the first phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a first phase value, and when the power supply voltage of the Doherty power amplifier circuit is the minimum envelope voltage, the first phase value is the optimal phase value of the Doherty power amplifier circuit; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be the set maximum value of the envelope signal, generating a second phase modulation control signal according to the envelope signal; the second phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a second phase value, and when the power supply voltage of the Doherty power amplifier circuit is the maximum envelope voltage, the second phase value is the optimal phase value of the Doherty power amplifier circuit; wherein the set envelope signal maximum is greater than the set envelope turn-on threshold; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be larger than the set envelope starting threshold value and smaller than the set maximum value of the envelope signal, generating a third phase modulation control signal according to the envelope signal; the third phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplification link and the phase-modulated signal of the auxiliary power amplification link to be a third phase value; and the third phase value is obtained by performing linear interpolation operation according to the current value of the envelope signal, the first phase value, the second phase value, the envelope opening threshold value corresponding to the first phase value and the envelope signal maximum value corresponding to the second phase value.
2. The control method of claim 1, wherein phase modulating signals of the main power amplifier link and/or the auxiliary power amplifier link of the doherty power amplifier circuit based on the generated phase modulated control signal, comprises:
after performing frequency conversion processing on baseband signals corresponding to a main power amplifier link and/or an auxiliary power amplifier link of the Doherty power amplifier circuit, performing phase modulation on signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit; alternatively, the first and second electrodes may be,
before the frequency conversion processing is carried out on the baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, the phase modulation is carried out on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit.
3. The control method according to claim 1, wherein the number of auxiliary power amplifiers of the doherty power amplifier circuit is one or more; and, if the number of the auxiliary power amplifiers of the doherty power amplifier circuit is plural, then the phase modulation is performed on the signal of the auxiliary power amplifier link of the doherty power amplifier circuit, including:
and performing phase modulation on signals of all auxiliary power amplification links of the Doherty power amplification circuit.
4. The control method of claim 1, wherein said envelope control circuit includes an envelope modulator connected to each of the power amplifiers in said doherty power amplifier circuit, said one envelope modulator for outputting an envelope voltage to each of the power amplifiers in the doherty power amplifier circuit; alternatively, the first and second electrodes may be,
the multi-power amplifier circuit comprises a plurality of envelope modulators which are correspondingly connected with each power amplifier in the Doherty power amplifier circuit one by one, wherein each envelope modulator in the plurality of envelope modulators is used for outputting envelope voltage to the corresponding power amplifier in the Doherty power amplifier circuit.
5. The control method of claim 1, wherein the phase modulation is digital phase modulation or analog phase modulation.
6. A power amplifier control device is suitable for a power amplifier system comprising an envelope control circuit and a Doherty power amplifier circuit, wherein the envelope control circuit comprises an envelope modulator which is used for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage to the Doherty power amplifier circuit as a power supply voltage; doherty power amplifier circuit includes main power amplifier and auxiliary power amplifier, main power amplifier, auxiliary power amplifier are used for carrying out amplification processing to the baseband signal of baseband unit output according to the envelope voltage of envelope modulator output respectively, its characterized in that, the device includes:
the signal generating unit is used for generating a phase modulation control signal according to the envelope signal output by the baseband unit;
a signal phase modulation unit, configured to perform phase modulation on a signal of a main power amplifier link and/or an auxiliary power amplifier link of the doherty power amplifier circuit according to the generated phase modulation control signal, so that a phase difference between the signal of the main power amplifier link and the signal of the auxiliary power amplifier link after the phase modulation is a set value corresponding to a current value of the envelope signal, where the set value is an optimal phase value of the doherty power amplifier circuit when a supply voltage of the doherty power amplifier circuit is the envelope voltage corresponding to the current value of the envelope signal;
the signal generating unit is specifically configured to generate a first phase modulation control signal according to an envelope signal if it is determined that a current value of the envelope signal is not greater than a set envelope starting threshold; the first phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a first phase value, and when the power supply voltage of the Doherty power amplifier circuit is the minimum envelope voltage, the first phase value is the optimal phase value of the Doherty power amplifier circuit; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be the set maximum value of the envelope signal, generating a second phase modulation control signal according to the envelope signal; the second phase modulation control signal can enable the phase difference between the phase-modulated signals of the main power amplifier link and the auxiliary power amplifier link to be a second phase value, and when the power supply voltage of the Doherty power amplifier circuit is the maximum envelope voltage, the second phase value is the optimal phase value of the Doherty power amplifier circuit; wherein the set envelope signal maximum is greater than the set envelope turn-on threshold; alternatively, the first and second electrodes may be,
if the current value of the envelope signal is determined to be larger than the set envelope starting threshold value and smaller than the set maximum value of the envelope signal, generating a third phase modulation control signal according to the envelope signal; the third phase modulation control signal can enable the phase difference between the phase-modulated signal of the main power amplification link and the phase-modulated signal of the auxiliary power amplification link to be a third phase value; and the third phase value is obtained by performing linear interpolation operation according to the current value of the envelope signal, the first phase value, the second phase value, the envelope opening threshold value corresponding to the first phase value and the envelope signal maximum value corresponding to the second phase value.
7. The control device of claim 6,
the signal phase modulation unit is specifically used for performing phase modulation on signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit after performing frequency conversion processing on baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit; alternatively, the first and second electrodes may be,
before the frequency conversion processing is carried out on the baseband signals corresponding to the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit, the phase modulation is carried out on the signals of the main power amplifier link and/or the auxiliary power amplifier link of the Doherty power amplifier circuit.
8. The control apparatus of claim 6, wherein the number of auxiliary power amplifiers of the Doherty power amplifying circuit is one or more;
the signal phase modulation unit is specifically used for performing phase modulation on signals of each auxiliary power amplification link of the Doherty power amplification circuit when the number of the auxiliary power amplifiers of the Doherty power amplification circuit is multiple and the signals of the auxiliary power amplification links of the Doherty power amplification circuit need to be phase-modulated.
9. The control apparatus of claim 6, wherein said envelope control circuit includes an envelope modulator connected to each of the power amplifiers in said Doherty power amplifier circuit, said envelope modulator for outputting an envelope voltage to each of the power amplifiers in the Doherty power amplifier circuit; alternatively, the first and second electrodes may be,
the multi-power amplifier circuit comprises a plurality of envelope modulators which are correspondingly connected with each power amplifier in the Doherty power amplifier circuit one by one, wherein each envelope modulator in the plurality of envelope modulators is used for outputting envelope voltage to the corresponding power amplifier in the Doherty power amplifier circuit.
10. The control apparatus of claim 6, wherein said phase modulation is digital phase modulation or analog phase modulation.
11. A power amplifier control system comprises a power amplifier system comprising an envelope control circuit and a Doherty power amplifier circuit, wherein the envelope control circuit comprises an envelope modulator which is used for generating an envelope voltage according to an envelope signal output by a baseband unit and outputting the envelope voltage to the Doherty power amplifier circuit as a power supply voltage; the doherty power amplifier circuit comprises a main power amplifier and an auxiliary power amplifier, wherein the main power amplifier and the auxiliary power amplifier are respectively used for amplifying baseband signals output by a baseband unit according to envelope voltage output by an envelope modulator, and the doherty power amplifier control system is characterized by further comprising the power amplifier control device in any one of claims 6 to 10.
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